I'm not sure whether to laugh or be very angry, to be told that letting a 12 year old play an 18 rated game is little short of child neglect. I think children who really have been neglected would tell you otherwise, so I think I'm coming down on the side of angry.That is very insulting to the thousands of very good parents who just make different choices.
I think playing on line is a separate issue - you can't control who they will meet there and so it is risky. The same way that fb is risky.
Not all 12 year olds are the same and not all 18 rated games are the same. I would trust my own judgement more than someone else's. An example I can think of is the TV watershed. There are programmes shown before 9pm that are shown at this time because they have no explicit sex scenes or violence, but are still wholly unsuitable for children. You wouldn't know that if you only relied on the people who decide what is pre and post watershed. It's the same with games and films. It's a guideline and that's all.
There are some adults who shouldn't be playing these games from an emotional maturity pov and some kids who are not affected by them in the slightest. It may not be 'nice' but boys especially do love 'shoot-em-up' games.
I don't buy into this idea that it is damaging to children. If they lived in one room and never did/saw anything else, then yes, it would be. But as part of a varied and balanced life, then no, I don't think it is. Obviously it depends on the personality of the child.
I grew up watching horror films at friends houses and have not been adversely affected. I think children need to be given more credit because they do differentiate between what is real and what is not.
There is an implication that if you let a child play one game you will let them play all games and that's not true. Most parents just decide for themselves whether they think something will affect their dc negatively or not.
I know lots of nice, normal families whose children play 18+ games. They are not weak parents or neglectful in any way.